package com.tiem_files.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebFilter(urlPatterns = {"/user/*","/meet/*","/dept/*","/article/*"},dispatcherTypes ={DispatcherType.FORWARD,DispatcherType.REQUEST} )
public class LoginFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp  = (HttpServletResponse) servletResponse;
        Object userId = req.getSession().getAttribute("myUserId");
        if (userId == null){
            //重定向到登录页
            resp.sendRedirect(req.getContextPath() + "/index.jsp");
            return;
        }
        filterChain.doFilter(req,resp);
    }

    @Override
    public void destroy() {

    }
}
